US8824408B2 - Method of handling random access procedure associated to cell deactivation - Google Patents

Method of handling random access procedure associated to cell deactivation Download PDF

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US8824408B2
US8824408B2 US13/568,119 US201213568119A US8824408B2 US 8824408 B2 US8824408 B2 US 8824408B2 US 201213568119 A US201213568119 A US 201213568119A US 8824408 B2 US8824408 B2 US 8824408B2
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random access
access procedure
secondary cell
signaling
deactivation
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US20130039294A1 (en
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Chun-Yen Wang
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Acer Inc
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Industrial Technology Research Institute ITRI
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Priority to US13/568,119 priority Critical patent/US8824408B2/en
Priority to JP2012178481A priority patent/JP2013042500A/ja
Priority to KR1020120087869A priority patent/KR101461456B1/ko
Priority to TW101128975A priority patent/TWI461087B/zh
Priority to EP12180029.6A priority patent/EP2557885B1/en
Priority to CN201210288720.3A priority patent/CN102958191B/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1835—Buffer management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/04—Scheduled access

Definitions

  • the application relates to a method utilized in a wireless communication system, and more particularly, to a method of handling random access procedure associated to cell deactivation in a wireless communication system.
  • LTE-Advanced system Toward advanced high-speed wireless communication system, such as transmitting data in a higher peak data rate, LTE-Advanced system is standardized by the 3rd Generation Partnership Project (3GPP) as an enhancement of LTE system.
  • 3GPP 3rd Generation Partnership Project
  • LTE-Advanced system targets faster switching between power states, improves performance at the cell edge, and includes subjects, such as bandwidth extension, coordinated multipoint transmission/reception (COMP), uplink multiple input multiple output (MIMO), etc.
  • 3GPP 3rd Generation Partnership Project
  • carrier aggregation is introduced to the LTE-Advanced system for extension to wider bandwidth, where two or more component carriers are aggregated, for supporting wider transmission bandwidths (for example up to 100 MHz) and for spectrum aggregation.
  • carrier aggregation capability multiple component carriers are aggregated into overall wider bandwidth, where the UE can establish multiple links corresponding to the multiple component carriers for simultaneously receiving and transmitting.
  • the UE only has one RRC connection with the network.
  • RRC connection establishment/re-establishment/handover one serving cell provides the NAS mobility information
  • RRC connection re-establishment/handover one serving cell provides the security input. This cell is referred to as a primary cell (PCell).
  • PCell primary cell
  • the component carrier corresponding to the PCell is the Downlink Primary Component Carrier (DL PCC) while in the uplink it is the Uplink Primary Component Carrier (UL PCC).
  • DL PCC Downlink Primary Component Carrier
  • U PCC Uplink Primary Component Carrier
  • SCell secondary cell
  • the PCell i.e. the UL and DL PCC
  • the SCell may be activated or deactivated according to specific conditions (e.g. an amount of data for transmission).
  • the UE shall not monitor the physical downlink control channel (PDCCH) of the SCell and shall not receive any downlink assignments or uplink grants associated to the SCell.
  • the UE shall not transmit on UL-SCH on the SCell and not transmit SRS on the SCell.
  • the network activates and deactivates the SCell by sending the Activation/Deactivation command.
  • the UE starts a deactivation timer for the SCell when the SCell is activated, wherein the SCell is deactivated when the deactivation timer expires.
  • a UE of a PCell and one SCell or more SCells it is possible to configure a UE of a PCell and one SCell or more SCells. Therefore, multiple timing alignments, each for synchronization with a serving base station on uplink timing for preventing signals transmitted from the UE from colliding with those sent from other UEs under the coverage of the base station, are needed for PCell and SCell or more SCells.
  • serving cells having uplink to which the same timing alignment applies are grouped in a timing alignment group (TAG).
  • TAG timing alignment group
  • Each timing alignment group contains at least one serving cell with configured UL, and the mapping of each serving cell to a timing alignment group is configured by the serving eNB.
  • a random access (RA) procedure is used to obtain initial UL time alignment for a SCell not group together with the PCell.
  • RA random access
  • the UE needs to monitor PDCCH to receive message 2 of the RA procedure (i.e. random access response) and/or message 4 (i.
  • the UE may not monitor the PDCCH on the SCell or for the SCell. According to the current 3GPP specification, the UE may perform power ramping, and retransmits message 1 (i.e. random access preamble) again and again.
  • message 1 i.e. random access preamble
  • the application discloses a method of handling random access procedure associated to cell deactivation in a wireless communication system to solve the abovementioned problems.
  • a method of handling random access procedure associated to cell deactivation for a mobile device in a wireless communication system comprises activating a secondary cell configured by a network of the wireless communication system, performing a random access procedure for the activated secondary cell, and when the secondary cell is deactivated during the random access procedure, continuously performing the random access procedure.
  • a method of handling random access procedure on secondary cell for a mobile device in a wireless communication system comprises activating a secondary cell configured by a network of the wireless communication system, performing a random access procedure for the activated secondary cell, and when the secondary cell is deactivated during the random access procedure, aborting the random access procedure.
  • a method of handling random access procedure on secondary cell for a network in a wireless communication system comprises configuring a secondary cell for a mobile device of the wireless communication system, and providing a signaling for indicating the priority between a random access procedure and a deactivation of the secondary cell, to the mobile device.
  • FIG. 1 illustrates a schematic diagram of an exemplary wireless communication system.
  • FIG. 2 is a schematic diagram of a user equipment and multiple cells in a wireless communication system in FIG. 1 .
  • FIG. 3 illustrates a schematic diagram of an exemplary communication device.
  • FIG. 4 is a flowchart of an exemplary process.
  • FIG. 5 is a flowchart according to a first embodiment of the present invention.
  • FIG. 6 is a flowchart of an exemplary process.
  • FIG. 7 is a flowchart according to a second embodiment of the present invention.
  • FIG. 8 is a flowchart of an exemplary process.
  • FIG. 9 is a flowchart according to third embodiment of the present invention.
  • FIG. 1 is a schematic diagram of a wireless communication system 10 .
  • the wireless communication system 10 is a Long-Term Evolution advanced (LTE-Advanced) system or other mobile communication systems, and is briefly composed of a network and a plurality of user equipments (UEs).
  • the network and the UEs are simply utilized for illustrating the structure of the wireless communication system 10 .
  • the network may be an evolved universal terrestrial radio access network (E-UTRAN) comprising a plurality of evolved base stations (eNBs).
  • E-UTRAN evolved universal terrestrial radio access network
  • eNBs evolved base stations
  • the UEs can be devices such as mobile phones, computer systems, a camera, a television, a hand-held video game device, a musical device, a wireless sensor, etc.
  • a UE may be a fixed computing device operating in a mobile environment, such as a bus, a train, an airplane, a boat, a car, etc.
  • the network and the UE can be seen as a transmitter or receiver according to transmission direction, e.g., for uplink (UL), the UE is the transmitter and the network is the receiver, and for downlink (DL), the network is the transmitter and the UE is the receiver.
  • UL uplink
  • DL downlink
  • FIG. 2 is a schematic diagram of a UE and multiple cells in the wireless communication system 10 .
  • the UE communicates with one primary cell (PCell) and several secondary cells (SCells), as SCell 1 -SCell N shown in FIG. 2 .
  • the component carrier corresponding to the PCell is the downlink primary component carrier (DL PCC) while in the uplink it is the uplink primary component carrier (UL PCC).
  • DL PCC downlink primary component carrier
  • UL PCC uplink primary component carrier
  • SCells can be configured to form together with the PCell a set of serving cells.
  • the component carrier corresponding to a SCell is a downlink secondary component carrier (DL SCC) while in the uplink it is an uplink secondary component carrier (UL SCC).
  • DL SCC downlink secondary component carrier
  • UL SCC uplink secondary component carrier
  • FIG. 3 illustrates a schematic diagram of an exemplary communication device 30 .
  • the communication device 30 can be the UE shown in FIG. 1 , but is not limited herein.
  • the communication device 30 may include a processing means 300 such as a microprocessor or Application Specific Integrated Circuit (ASIC), a storage unit 310 and a communication interfacing unit 320 .
  • the storage unit 310 may be any data storage device that can store program code 314 , for access by the processing means 300 . Examples of the storage unit 310 include but are not limited to a subscriber identity module (SIM), read-only memory (ROM), flash memory, random-access memory (RAM), CD-ROMs, magnetic tape, hard disk, and optical data storage device.
  • SIM subscriber identity module
  • ROM read-only memory
  • RAM random-access memory
  • CD-ROMs magnetic tape
  • hard disk and optical data storage device.
  • the communication interfacing unit 320 is preferably a radio transceiver and can exchange wireless signals with the network (i.e. PCell or SC
  • FIG. 4 illustrates a flowchart of an exemplary process 40 .
  • the process 40 is utilized in a UE for handling random access procedure upon SCell deactivation.
  • the process 40 can be compiled into the program code 314 and includes the following steps:
  • Step 400 Start.
  • Step 410 Activate a SCell configured by a network of the wireless communication system.
  • Step 420 Perform a random access procedure for the activated SCell.
  • Step 430 When the SCell is deactivated during the random access procedure, continuously perform the random access procedure.
  • Step 440 End.
  • the UE when the UE performs the random access procedure for the SCell but the SCell is deactivated during the random access procedure, the UE continuously performs the random access procedure. In this situation, the UE may consider that the random access procedure is prioritized over SCell deactivation.
  • FIG. 2 and FIG. 5 is a flowchart according to an embodiment.
  • a UE is configured with the PCell, and SCell 1 -N.
  • the UE activates the SCell 1
  • the UE starts a deactivation timer for the SCell 1 .
  • the UE performs a random access procedure for the SCell 1 (or for a timing alignment group (TAG)) for acquiring uplink timing alignment.
  • TAG timing alignment group
  • the UE receives a PDCCH order from the network, which triggers the UE to perform a random access procedure for the SCell 1 (or for a timing alignment group (TAG)), or UE triggers a contention-based random access procedure for the SCell 1 (or for a timing alignment group (TAG)).
  • the UE continuously monitors the physical downlink control channel (PDCCH) in associated subframes for the random access procedure if the SCell 1 is deactivated (e.g., the deactivation timer for the SCell 1 expires during the random access procedure or the UE receives a signaling (e.g., Activation/Deactivation command) for deactivating the SCell 1 from the network during the random access procedure).
  • PDCCH physical downlink control channel
  • the associated subframes may be the subframes the network may send RA message 2 (i.e. random access response) and/or RA message 4 (contention resolution).
  • the associated subframes may not be on the SCell.
  • the network may send the RA message 2 and/or RA message 4 on the PCell or on the other SCell.
  • the network and/or UE may reactivate the SCell(s) which was deactivated, and restart the associated deactivation timer(s).
  • the network and/or UE may continue the random access procedure on the SCell 1 .
  • the SCell 1 on which the random access procedure is performed is deactivated (e.g., the deactivation timer for the SCell 1 expires during the random access procedure or the UE receives a signaling (e.g., MAC Activation/Deactivation command) for deactivating the SCell 1 from the network during the random access procedure)
  • the network and/or UE may continue the random access procedure on the SCell 1 .
  • the network and/or UE may continue the on-going random access procedure or start a new random access procedure on another SCell. For example, the network and/or UE may choose another activated SCell 2 from the same TAG, and perform a random access procedure on the activated SCell 2 for uplink timing adjustment.
  • Step 600 Start.
  • Step 610 Activate a secondary cell configured by a network of the wireless communication system.
  • Step 620 Perform a random access procedure for the activated secondary cell.
  • Step 630 When the secondary cell is deactivated during the random access procedure, abort the random access procedure.
  • the UE when the UE performs the random access procedure for the SCell but the SCell is deactivated during the random access procedure, the UE stops or aborts the ongoing random access procedure. In this situation, the UE may consider that the SCell deactivation is prioritized over the random access procedure.
  • FIG. 2 and FIG. 7 is a flowchart according to an embodiment.
  • a UE is configured with the PCell, and SCell 1 -N.
  • the UE activates the SCell 1
  • the UE starts a deactivation timer for the SCell 1 .
  • the UE performs a random access procedure for the SCell 1 (or for a timing alignment group (TAG)) for acquiring uplink timing alignment.
  • TAG timing alignment group
  • FIG. 8 illustrates a flowchart of an exemplary process 80 .
  • the process 80 is utilized in a network for handling random access procedure on SCell.
  • the process 80 can be compiled into the program code 314 and includes the following steps:
  • Step 800 Start.
  • Step 810 Configure a secondary cell for a UE of the wireless communication system.
  • Step 820 Provide a signaling for indicating the priority between a random access procedure and a deactivation of the secondary cell, to the UE.
  • the prioritization between the random access procedure and SCell deactivation is determined by the network.
  • the network transmits a signalling (e.g. by RRC signalling or by PDCCH order) for indicating the prioritization to the UE, so that the UE can determine whether to continuously performs the random access procedure (namely the process 40 ) or stop/aborts the random access procedure (namely the process 60 ) according to the prioritization.
  • a signalling e.g. by RRC signalling or by PDCCH order
  • FIG. 2 and FIG. 9 is a flowchart according to an embodiment.
  • a UE is configured with the PCell, and SCell 1 -N.
  • the UE activates the SCell 1
  • the UE starts a deactivation timer for the SCell 1 .
  • the UE performs a random access procedure for the SCell 1 (or for a timing alignment group (TAG)) for acquiring uplink timing alignment.
  • TAG timing alignment group
  • the UE receives a PDCCH order from the network, which triggers the UE to perform a random access procedure for the SCell 1 (or for a timing alignment group (TAG)), or UE triggers a contention-based random access procedure for the SCell 1 (or for a timing alignment group (TAG)).
  • the prioritization between the random access procedure and SCell deactivation may be provided by the network. In some embodiments, the prioritization may be provided by RRC Connection Reconfiguration message or PDCCH order which initiates the random access procedure. If the random access procedure has higher priority than the SCell deactivation, the UE continuously monitors PDCCH in associated subframes (TTIs) for the random access procedure when the SCell 1 is deactivated (e.g.
  • the UE stops or aborts the random access procedure when the SCell 1 is deactivated (e.g. the deactivation timer for the SCell 1 expires during the random access procedure or the UE receives a signaling (e.g. MAC Activation/Deactivation command) for deactivating the SCell 1 from the network during the random access procedure).
  • a signaling e.g. MAC Activation/Deactivation command
  • the UE deactivates the SCell, and stops or aborts the random access procedure.
  • a signaling e.g., MAC Activation/Deactivation command
  • the abovementioned steps of the processes including suggested steps can be realized by means that could be hardware, firmware known as a combination of a hardware device and computer instructions and data that reside as read-only software on the hardware device, or an electronic system.
  • hardware can include analog, digital and mixed circuits known as microcircuit, microchip, or silicon chip.
  • the electronic system can include system on chip (SOC), system in package (Sip), computer on module (COM), and the communication device 20 .
  • SOC system on chip
  • Sip system in package
  • COM computer on module
  • the present invention provides methods for handling random access procedure upon SCell deactivation.
  • the UE keeps the random access procedure running if the SCell deactivation occurs during the random access procedure.
  • the UE stops/aborts the random access procedure if the SCell deactivation occurs during the random access procedure.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
US13/568,119 2011-08-11 2012-08-06 Method of handling random access procedure associated to cell deactivation Active 2032-09-26 US8824408B2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US13/568,119 US8824408B2 (en) 2011-08-11 2012-08-06 Method of handling random access procedure associated to cell deactivation
EP12180029.6A EP2557885B1 (en) 2011-08-11 2012-08-10 Method of handling random access procedure associated to cell deactivation
KR1020120087869A KR101461456B1 (ko) 2011-08-11 2012-08-10 셀 비활성화에 관련된 랜덤 액세스 절차를 취급하는 방법
TW101128975A TWI461087B (zh) 2011-08-11 2012-08-10 處理關於細胞關閉的隨機存取程序的方法
JP2012178481A JP2013042500A (ja) 2011-08-11 2012-08-10 セル不活性化に関連するランダム・アクセス手順を扱う方法
CN201210288720.3A CN102958191B (zh) 2011-08-11 2012-08-13 处理关于细胞关闭的随机存取程序的方法

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US201161522255P 2011-08-11 2011-08-11
US13/568,119 US8824408B2 (en) 2011-08-11 2012-08-06 Method of handling random access procedure associated to cell deactivation

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US20130039294A1 US20130039294A1 (en) 2013-02-14
US8824408B2 true US8824408B2 (en) 2014-09-02

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EP (1) EP2557885B1 (ko)
JP (1) JP2013042500A (ko)
KR (1) KR101461456B1 (ko)
CN (1) CN102958191B (ko)
TW (1) TWI461087B (ko)

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